The window "Domain" displays a domain as a
wireframe, a point (u_{0}, v_{0}) in the domain, and
the u-constant and
v-constant curves through that point in red and green, respectively.

The window "Surface X(u,v)" shows the surface of revolution about the
z-axis, X(u,v) = (f(v)*cos(u), f(v)*sin(u), g(v)), for the
given domain and the images of the point and the curves from the
"Domain" window.

It is possible to change u_{0}, v_{0},
f(v), and g(v) in the control
window.